CN216643248U

CN216643248U - Ultrahigh pressure normally-open pneumatic control valve and ultrahigh pressure normally-closed pneumatic control valve

Info

Publication number: CN216643248U
Application number: CN202122626696.7U
Authority: CN
Inventors: 张潇; 梁旭强; 陈似君; 倪万林; 蔡诗俊
Original assignee: Sichuan Aviation Industry Chuanxi Machine Co ltd
Current assignee: Sichuan Aviation Industry Chuanxi Machine Co ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-05-31
Anticipated expiration: 2031-10-29

Abstract

The utility model discloses an ultrahigh pressure pneumatic control valve which comprises a normally open pneumatic control valve and a normally closed pneumatic control valve, and comprises a cylinder body (9), a piston (13), a bracket (5), a valve body (1), a valve rod (7) and a valve core (2), wherein the cylinder body (9) is provided with a control gas inlet (C), the piston (13) is pushed to move up and down under the combined action of control gas pressure and a spring (10), the piston (13) pushes the control valve rod (7) to move up and down, the control valve rod (7) moves to drive the valve core (2) to move, and the up and down movement of the valve core (2) realizes the on-off control of high-pressure airflow of a high-pressure gas inlet (A) and a high-pressure gas outlet (B), so that the ultrahigh pressure pneumatic control valve is safe and reliable by adopting an absolute isolation mode of control gas and working gas, and the split structure of the valve rod (7) and the valve core (2) is adopted, thereby greatly reducing the requirement on the processing precision and being easy to process, greatly reducing the processing cost.

Description

Ultrahigh pressure normally-open pneumatic control valve and ultrahigh pressure normally-closed pneumatic control valve

Technical Field

The utility model relates to an ultrahigh pressure pneumatic control valve, in particular to an ultrahigh pressure pneumatic control valve applied to pressure of 20-200 MPa.

Background

The ultrahigh-pressure pneumatic control valve used by the existing ultrahigh-pressure equipment is often over-designed in size for reliability; the valve rod adopts an integrated structure, so that the requirement on machining precision is high, and the machining is difficult; in addition, the traditional ultrahigh pressure pneumatic control valve is complex in structure and inconvenient to maintain after a fault occurs. Therefore, an ultrahigh pressure pneumatic control valve with low use cost and high safety reliability is urgently needed.

Disclosure of Invention

The utility model aims to provide an ultrahigh pressure pneumatic control valve which is high in reliability and low in use cost.

The utility model is realized by the following technical scheme: the ultrahigh pressure normally open pneumatic control valve is characterized by comprising a cylinder body, a piston, a support, a valve body, a valve rod and a valve core, wherein the piston is arranged in the cylinder body, a control air inlet C is formed in the upper end of the cylinder body, the lower end of the cylinder body is fixedly connected with the upper end of the support, an elastic resetting component is arranged between the piston and the upper end of the support, one end of the valve rod is fixedly connected with the lower end face of the piston, the other end of the valve rod extends into the upper end of the support to be connected with one end of the valve core, the lower end of the support is connected with one end of the valve body, a pore cavity matched with the other end of the valve core is axially formed in the valve body, a high-pressure gas outlet B and a high-pressure gas inlet A are sequentially formed in the valve body in the radial direction, and the high-pressure gas outlet B and the high-pressure gas inlet A are communicated with the pore cavity.

In order to further better implement the utility model, the following arrangement structure is particularly adopted: the cylinder body is characterized by further comprising an upper cover and a lower cover, the upper cover is hermetically arranged in the inner cavity of the cylinder body and forms the upper end of the cylinder body, a through hole serving as a control air inlet C is formed in the upper cover, a cavity communicated with the through hole and used for containing control air is formed in the lower end face of the upper cover, the lower cover is arranged in the inner cavity of the cylinder body and forms the lower end of the cylinder body, and a cavity used for containing the elastic resetting component is formed in the lower cover.

In order to further better implement the utility model, the following arrangement structure is particularly adopted: the elastic reset component is a spring or rubber sleeved on the valve rod.

In order to further better implement the utility model, the following arrangement structure is particularly adopted: o-shaped rings are adopted for sealing between the upper cover and the cylinder body and between the piston and the cylinder body.

The utility model is realized by the following another technical scheme: the ultrahigh pressure normally closed pneumatic control valve is characterized by comprising a cylinder body, a piston, a support, a valve body, a valve rod and a valve core, wherein the piston is arranged in the cylinder body, a control gas inlet C is formed in the lower end of the cylinder body, the lower end of the cylinder body is fixedly connected with the upper end of the support, the upper end of the piston is contacted with an elastic reset component, one end of the valve rod is fixedly connected with the lower end face of the piston, the other end of the valve rod extends into the upper end of the support to be connected with one end of the valve core, the lower end of the support is connected with one end of the valve body, a hole cavity matched with the other end of the valve core is axially formed in the valve body, a high-pressure gas outlet B and a high-pressure gas inlet A are radially and sequentially formed in the valve body, and the high-pressure gas outlet B and the high-pressure gas inlet A are communicated with the hole cavity.

Further, in order to better realize another technical scheme of the utility model, the following arrangement structure is particularly adopted: the cylinder body is characterized by further comprising an upper cover and a lower cover, the upper cover is arranged in the inner cavity of the cylinder body and forms the upper end of the cylinder body, the elastic reset component is arranged between the upper cover and the upper end of the piston, the lower cover is hermetically arranged in the inner cavity of the cylinder body and forms the lower end of the cylinder body, the lower cover is provided with a through hole serving as a control air inlet C, and the upper end face of the lower cover is provided with a concave cavity communicated with the through hole and used for containing control air.

Further, in order to better realize another technical scheme of the utility model, the following arrangement structure is particularly adopted: the upper cover is fixedly provided with a cap cover for accommodating the elastic reset component, the upper end of the cap cover is provided with an adjusting screw, the lower end of the adjusting screw is contacted with the big end of a pressure lever arranged in the cap cover, and the elastic reset component is a spring arranged between the big end of the pressure lever and the upper end surface of the piston.

Further, in order to better realize another technical scheme of the utility model, the following arrangement structure is particularly adopted: o-shaped rings are adopted for sealing between the lower cover and the cylinder body and between the piston and the cylinder body.

In order to further better realize the ultrahigh pressure normally open pneumatic control valve or normally closed pneumatic control valve, the utility model particularly adopts the following arrangement structure: the upper end of the upper cover is limited through a first check ring, and the lower cover is limited through a second check ring.

Further, in order to better realize the ultrahigh pressure normally open pneumatic control valve and the ultrahigh pressure normally closed pneumatic control valve, the following arrangement structures are particularly adopted: the piston is provided with a bolt, one end of the valve rod is provided with a threaded hole, one end of the valve rod is fixedly connected to the lower end face of the piston through the bolt, the other end of the valve rod is connected with a connecting nut, one end of the valve core is connected with the connecting nut, the other end of the valve core is provided with an outer conical shape, the joint of the hole cavity of the valve body and the high-pressure gas outlet B is provided with an inner conical shape matched with the outer conical shape at the other end of the valve core, and the bolt and the piston are sealed by an O-shaped ring.

Further, in order to better realize the ultrahigh pressure normally open pneumatic control valve and the ultrahigh pressure normally closed pneumatic control valve, the following arrangement structures are particularly adopted: the valve body is provided with a step hole, an internal thread is formed in the upper section of the step hole, a sealing sleeve is arranged at the step, a third retaining ring is arranged at the lower end of the sealing sleeve, a 0-shaped ring is arranged below the third retaining ring, the upper end of the sealing sleeve is in contact with the lower end of a compression threaded sleeve in the upper section of the step hole in a threaded manner, a hole cavity matched with the other end of the valve core is formed in the compression threaded sleeve, and a dust ring is arranged in the hole cavity.

Further, in order to better realize the ultrahigh pressure normally open pneumatic control valve and the ultrahigh pressure normally closed pneumatic control valve, the following arrangement structures are particularly adopted: the upper end of the bracket is provided with a guide sleeve matched with the valve rod.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

according to the ultrahigh-pressure normally-open pneumatic control valve and the ultrahigh-pressure normally-closed pneumatic control valve, when no pressure gas enters the control gas inlet C, the valve core automatically resets under the thrust of the spring, the valve core of the normally-open pneumatic control valve upwards opens the high-pressure gas outlet B, and the high-pressure gas inlet A is communicated with the high-pressure gas outlet B; and the valve core of the normally closed pneumatic control valve downwards closes the high-pressure gas outlet B, and the high-pressure gas inlet A is blocked from the high-pressure gas outlet B. When the control gas inlet C is filled with pressure gas, the valve core finishes closing or opening the high-pressure gas outlet B under the thrust of the pressure gas, so that the high-pressure gas inlet A and the high-pressure gas outlet B are blocked or communicated. Therefore, the pneumatic control valve adopts a control gas and working gas absolute isolation mode, and is safe and reliable; the split type structure of the valve rod and the valve core is adopted, so that the requirement on machining precision is greatly reduced, the machining is easy, and the machining cost is greatly reduced; in addition, the valve core and the valve body are sealed by the conical surface, the sealing area is large, the valve core is not easy to damage, and in the working process of the pneumatic control valve, the valve core frequently contacts with the conical surface of the valve body due to the up-and-down movement of the valve core under the action of the spring and the control air pressure, and the two sealing surfaces are ground, so that the sealing effect is better, and the reliability is higher; the upper cover is positioned through the first check ring, and the lower cover is positioned through the second check ring, so that the structure is simple, the weight of a single valve body is reduced, and the assembly and the maintenance are convenient; using a piston and a spool such as 10: 1, the design of large diameter ratio can greatly reduce the requirement on controlling air pressure; the ultrahigh pressure pneumatic control valve with the structure is suitable for the working environment conditions of medium and low pressure gas and the working environment conditions of ultrahigh pressure gas.

Drawings

Fig. 1 is a schematic structural diagram of an ultrahigh-pressure normally-open pneumatic control valve.

Fig. 2 is a schematic structural diagram of an ultrahigh-pressure normally-closed pneumatic control valve.

In the figure: 1. the valve comprises a valve body, 2 parts of a valve core, 3 parts of a compression screw sleeve, 4 parts of a dust ring, 5 parts of a support, 6 parts of a connecting nut, 7 parts of a valve rod, 8 parts of a bolt, 9 parts of a cylinder body, 10 parts of a spring, 11 parts of a first retainer ring, 12 parts of an upper cover, 13 parts of a piston, 14 parts of a lower cover, 15 parts of a guide sleeve, 16 parts of a sealing sleeve, 17 parts of a third retainer ring, 18 parts of an O-shaped ring and 19 parts of a second retainer ring.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.

An ultrahigh pressure normally open pneumatic control valve is characterized by comprising a cylinder body 9, a piston 13, a bracket 5, a valve body 1, a valve rod 7 and a valve core 2, the piston 13 is arranged in the cylinder 9, the upper end of the cylinder 9 is provided with a control gas inlet C, the lower end of the cylinder 9 is fixedly connected with the upper end of the bracket 5, an elastic reset component is arranged between the piston 13 and the upper end of the bracket 5, one end of the valve rod 7 is fixedly connected with the lower end surface of the piston 13, the other end of the valve rod 7 extends into the upper end of the bracket 5 to be connected with one end of the valve core 2, the lower end of the bracket 5 is connected with one end of the valve body 1, the valve body 1 is axially provided with a pore cavity matched with the other end of the valve core 2, the valve body 1 is provided with a high-pressure gas outlet B and a high-pressure gas inlet A in sequence in the radial direction, and the high-pressure gas outlet B and the high-pressure gas inlet A are both communicated with the hole cavity.

In order to further better implement the utility model, the following arrangement structure is particularly adopted: the cylinder is characterized by further comprising an upper cover 12 and a lower cover 14, wherein the upper cover 12 is hermetically arranged in the inner cavity of the cylinder body 9 and forms the upper end of the cylinder body 9, a through hole serving as a control air inlet C is formed in the upper cover 12, a cavity communicated with the through hole and used for containing control air is formed in the lower end face of the upper cover 12, the lower cover 14 is arranged in the inner cavity of the cylinder body 9 and forms the lower end of the cylinder body 9, and a cavity used for containing the elastic resetting component is formed in the lower cover 14.

In order to further better implement the utility model, the following arrangement structure is particularly adopted: the elastic reset component is a spring 10 or rubber sleeved on the valve rod 7.

In order to further better implement the utility model, the following arrangement structure is adopted in particular: o-shaped rings are adopted for sealing between the upper cover 12 and the cylinder 9 and between the piston 13 and the cylinder 9.

The utility model is realized by the following another technical scheme: an ultrahigh pressure normally closed pneumatic control valve is characterized by comprising a cylinder body 9, a piston 13, a support 5, a valve body 1, a valve rod 7 and a valve core 2, wherein the piston 13 is arranged in the cylinder body 9, the lower end of the cylinder body 9 is provided with a control gas inlet C, the lower end of the cylinder body 9 is fixedly connected with the upper end of the support 5 through a screw, the upper end of the piston 13 is contacted with an elastic reset component, one end of the valve rod 7 is fixedly connected with the lower end surface of the piston 13, the other end of the valve rod 7 extends into the upper end of the support 5 to be connected with one end of the valve core 2, the lower end of the support 5 is connected with one end of the valve body 1 through a screw, the valve body 1 is axially provided with a hole cavity matched with the other end of the valve core 2, the valve body 1 is radially and sequentially provided with a high-pressure gas outlet B and a high-pressure gas inlet A, and the high-pressure gas outlet B and the high-pressure gas inlet A are both communicated with the hole cavity, the high-pressure gas outlet B and the high-pressure gas inlet A are internally provided with internal thread sections connected with the nozzle.

Further, in order to better realize another technical scheme of the utility model, the following arrangement structure is particularly adopted: the cylinder is characterized by further comprising an upper cover 12 and a lower cover 14, wherein the upper cover 12 is arranged in the inner cavity of the cylinder 9 and forms the upper end of the cylinder 9, the elastic reset component is arranged between the upper cover 12 and the upper end of the piston 13, the lower cover 14 is hermetically arranged in the inner cavity of the cylinder 9 and forms the lower end of the cylinder 9, the lower cover 14 is provided with a through hole serving as a control air inlet C, and the upper end face of the lower cover 14 is provided with a concave cavity communicated with the through hole and used for containing control air.

Further, in order to better realize another technical scheme of the utility model, the following arrangement structure is particularly adopted: the upper cover 12 is fixedly provided with a cap for accommodating the elastic reset component, the upper end of the cap is provided with an adjusting screw, the lower end of the adjusting screw is contacted with the big end of a pressure rod arranged in the cap, the adjusting screw is arranged on a threaded hole at the upper end of the cap, the adjusting screw is provided with a locking nut, the elastic reset component is a spring 10 arranged between the big end of the pressure rod and the upper end surface of a piston 13, the locking nut is loosened, and the adjusting screw is rotated to adjust the pressing force of the spring 10.

Further, in order to better realize another technical scheme of the utility model, the following arrangement structure is particularly adopted: o-shaped rings are adopted for sealing between the lower cover 14 and the cylinder 9 and between the piston 13 and the cylinder 9.

Further, in order to better realize the ultrahigh pressure normally open pneumatic control valve and the ultrahigh pressure normally closed pneumatic control valve, the following arrangement structures are particularly adopted: the upper end of the upper cover 12 is limited by a first retainer ring 11, and the lower cover 14 is limited by a second retainer ring 19.

Further, in order to better realize the ultrahigh pressure normally open pneumatic control valve and the ultrahigh pressure normally closed pneumatic control valve, the following arrangement structures are particularly adopted: the piston 13 is provided with a bolt 8, one end of the valve rod 7 is provided with a threaded hole, one end of the valve rod 7 is fixedly connected to the lower end face of the piston 13 through the bolt 8, the other end of the valve rod 7 is connected with a connecting nut 6, one end of the valve core 2 is connected with the connecting nut 6, the other end of the valve core 2 is provided with an outer conical shape, the joint of the hole cavity of the valve body 1 and the high-pressure gas outlet B is provided with an inner conical shape matched with the outer conical shape of the other end of the valve core 2, and an O-shaped ring is adopted for sealing between the bolt 8 and the piston 13.

Further, in order to better realize the ultrahigh pressure normally open pneumatic control valve and the ultrahigh pressure normally closed pneumatic control valve, the following arrangement structures are particularly adopted: the valve body 1 is provided with a step hole, an internal thread is formed in the upper section of the step hole, a sealing sleeve 16 is arranged at the step, a third retaining ring 17 is arranged at the lower end of the sealing sleeve 16, a 0-shaped ring 18 is arranged below the third retaining ring 17, the upper end of the sealing sleeve 16 is in contact with the lower end of a compression threaded sleeve 3 screwed on the upper section of the step hole, a hole cavity matched with the other end of the valve core 2 is formed in the compression threaded sleeve 3, and a dust ring 4 is arranged in the hole cavity.

Further, in order to better realize the ultrahigh pressure normally open pneumatic control valve and the ultrahigh pressure normally closed pneumatic control valve, the following arrangement structures are particularly adopted: the upper end of the bracket 5 is provided with a guide sleeve 15 matched with the valve rod 7.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.

Claims

1. The utility model provides an ultrahigh pressure normally opens gas accuse valve which characterized in that: comprises a cylinder body (9), a piston (13), a support (5), a valve body (1), a valve rod (7) and a valve core (2), wherein the piston (13) is arranged in the cylinder body (9), the upper end of the cylinder body (9) is provided with a control gas inlet (C), the lower end of the cylinder body (9) is fixedly connected with the upper end of the support (5), an elastic reset component is arranged between the piston (13) and the upper end of the support (5), one end of the valve rod (7) is fixedly connected with the lower end surface of the piston (13), the other end of the valve rod (7) extends into the upper end of the support (5) to be connected with one end of the valve core (2), the lower end of the support (5) is connected with one end of the valve body (1), the valve body (1) is axially provided with a hole cavity matched with the other end of the valve core (2), and the valve body (1) is radially and sequentially provided with a high-pressure gas outlet (B) and a high-pressure gas inlet (A), the high-pressure gas outlet (B) and the high-pressure gas inlet (A) are both communicated with the hole cavity.

2. The ultrahigh-pressure normally-open pneumatic control valve according to claim 1, characterized in that: the cylinder body is characterized by further comprising an upper cover (12) and a lower cover (14), wherein the upper cover (12) is hermetically arranged in the inner cavity of the cylinder body (9) and forms the upper end of the cylinder body (9), a through hole serving as a control gas inlet (C) is formed in the upper cover (12), a concave cavity communicated with the through hole and used for containing control gas is formed in the lower end face of the upper cover (12), the lower cover (14) is arranged in the inner cavity of the cylinder body (9) and forms the lower end of the cylinder body (9), and a cavity used for containing the elastic resetting component is formed in the lower cover (14).

3. The ultrahigh-pressure normally-open pneumatic control valve according to claim 2, characterized in that: the elastic reset component is a spring (10) or rubber sleeved on the valve rod (7).

4. The ultrahigh-pressure normally-open pneumatic control valve according to claim 3, characterized in that: o-shaped rings are adopted for sealing between the upper cover (12) and the cylinder body (9) and between the piston (13) and the cylinder body (9).

5. The ultrahigh-pressure normally-open pneumatic control valve according to claim 4, characterized in that: the upper end of the upper cover (12) is limited by a first check ring (11), and the lower cover (14) is limited by a second check ring (19).

6. The ultrahigh-pressure normally-open pneumatic control valve according to claim 4, characterized in that: the piston (13) is provided with a bolt (8), one end of the valve rod (7) is provided with a threaded hole, one end of the valve rod (7) is fixedly connected to the lower end face of the piston (13) through the bolt (8), the other end of the valve rod (7) is connected with the connecting nut (6), one end of the valve core (2) is connected with the connecting nut (6), the other end of the valve core (2) is provided with an outer conical shape, the joint of the pore cavity of the valve body (1) and the high-pressure gas outlet (B) is provided with an inner conical shape matched with the outer conical shape of the other end of the valve core (2), and the bolt (8) and the piston (13) are sealed by an O-shaped ring.

7. The ultrahigh-pressure normally-open pneumatic control valve according to claim 4, characterized in that: the valve body (1) is provided with a step hole, the upper section of the step hole is provided with an internal thread, a sealing sleeve (16) is arranged at the step position, the lower end of the sealing sleeve (16) is provided with a third retaining ring (17), a 0-shaped ring (18) is arranged below the third retaining ring (17), the upper end of the sealing sleeve (16) is in contact with the lower end of a pressing threaded sleeve (3) at the upper section of the step hole in a threaded manner, a hole cavity matched with the other end of the valve core (2) is formed in the pressing threaded sleeve (3), and a dust ring (4) is arranged in the hole cavity.

8. The ultrahigh-pressure normally-open pneumatic control valve according to claim 4, characterized in that: the upper end of the bracket (5) is provided with a guide sleeve (15) matched with the valve rod (7).

9. An ultrahigh pressure normally closed pneumatic control valve is characterized in that: comprises a cylinder body (9), a piston (13), a support (5), a valve body (1), a valve rod (7) and a valve core (2), wherein the piston (13) is arranged in the cylinder body (9), the lower end of the cylinder body (9) is provided with a control gas inlet (C), the lower end of the cylinder body (9) is fixedly connected with the upper end of the support (5), the upper end of the piston (13) is contacted with an elastic reset component, one end of the valve rod (7) is fixedly connected with the lower end surface of the piston (13), the other end of the valve rod (7) extends into the upper end of the support (5) to be connected with one end of the valve core (2), the lower end of the support (5) is connected with one end of the valve body (1), the valve body (1) is axially provided with a hole cavity matched with the other end of the valve core (2), and the valve body (1) is radially and sequentially provided with a high-pressure gas outlet (B) and a high-pressure gas inlet (A), the high-pressure gas outlet (B) and the high-pressure gas inlet (A) are both communicated with the hole cavity.

10. An ultrahigh pressure normally closed pneumatic control valve according to claim 9, characterized in that: still include upper cover (12) and lower cover (14), upper cover (12) dress cylinder body (9) inner chamber and formation the upper end of cylinder body (9), upper cover (12) with piston (13) upper end between set up the elasticity reset unit, lower cover (14) seal dress cylinder body (9) inner chamber and formation the lower extreme of cylinder body (9), lower cover (14) open and to have the through-hole that is control gas entry (C), lower cover (14) up end open have with the cavity of holding control gas of through-hole intercommunication.

11. An ultrahigh pressure normally closed pneumatic control valve according to claim 10, characterized in that: the upper cover (12) is fixedly provided with a cap cover for accommodating the elastic reset component, the upper end of the cap cover is provided with an adjusting screw, the lower end of the adjusting screw is contacted with the big end of a pressure lever arranged in the cap cover, and the elastic reset component is a spring (10) arranged between the big end of the pressure lever and the upper end surface of the piston (13).

12. An ultrahigh pressure normally closed pneumatic control valve according to claim 11, characterized in that: o-shaped rings are adopted for sealing between the lower cover (14) and the cylinder body (9) and between the piston (13) and the cylinder body (9).

13. An ultrahigh pressure normally closed pneumatic control valve according to claim 12, characterized in that: the upper end of the upper cover (12) is limited by a first check ring (11), and the lower cover (14) is limited by a second check ring (19).

14. An ultrahigh pressure normally closed pneumatic control valve according to claim 12, characterized in that: the piston (13) is provided with a bolt (8), one end of the valve rod (7) is provided with a threaded hole, one end of the valve rod (7) is fixedly connected to the lower end face of the piston (13) through the bolt (8), the other end of the valve rod (7) is connected with the connecting nut (6), one end of the valve core (2) is connected with the connecting nut (6), the other end of the valve core (2) is provided with an outer conical shape, the joint of the pore cavity of the valve body (1) and the high-pressure gas outlet (B) is provided with an inner conical shape matched with the outer conical shape of the other end of the valve core (2), and the bolt (8) and the piston (13) are sealed by an O-shaped ring.

15. An ultrahigh pressure normally closed pneumatic control valve according to claim 12, characterized in that: the valve body (1) is provided with a step hole, the upper section of the step hole is provided with an internal thread, a sealing sleeve (16) is arranged at the step position, the lower end of the sealing sleeve (16) is provided with a third retaining ring (17), a 0-shaped ring (18) is arranged below the third retaining ring (17), the upper end of the sealing sleeve (16) is in contact with the lower end of a pressing threaded sleeve (3) at the upper section of the step hole in a threaded manner, a hole cavity matched with the other end of the valve core (2) is formed in the pressing threaded sleeve (3), and a dust ring (4) is arranged in the hole cavity.

16. An ultrahigh pressure normally closed pneumatic control valve according to claim 12, characterized in that: the upper end of the bracket (5) is provided with a guide sleeve (15) matched with the valve rod (7).